Improvement in dook-looks



tuitritatts @gianni @ffice EDWIN ALLEN ANDv JMES BRADY, OF NORWICH, CONNECTICUT.

Letters Patent No. 68,334, dated September 3, 1867.

IMPROVEMENT IN DOOR-LOCKS.

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T0 ALL WHOM IT MAY CONCERN:

Be it known that we, EDWIN ALLEN and JAMES BRADY, both of Norwich, in the county ot'New London, and State of Connecticut, have invented certain new and useful Improvements in Locks; and we do hereby decla-re that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a. portion of this specification, in whichl Figure 1 isa side View ofa lock constructed according to our invention, with one side of the casing removed to show the internal partsthereof. n

Figure 2 is a vertical transverse section, taken in the'line a: :c of tig. 1.

Similar letters of reference indicate corresponding parts in both figures.

This invention consists in a novel means of working the tumblers, whereby the removal of the key from the lock, except when the parts are in position lock the door to which the lock is attached, is eifectually prevented, thus guarding against the liability of the door being left in an Aunlocked position when closed. The invention furthereonsists in a. novel arrangement of parts, whereby the most efficient action of the lending features of the invention is secured. n

Tolenable others to understand the construction and operation of our invention, we will proceed to describe it with reference to the drawings.

The rectangular caseof the lock is marked A, and pivoted opposite each other by pivots a at suitable points therein are two sets, B C, of tumblers. These tuniblers are formed of flat steel plates, and their shape is shown more fully in the side view, iig. 1. The tumbler-s of each series are separated from each other by a series of plates, which are placed alternately therewith, and kept in position by being attached to the pivots a, as rcpresented more fully inthe aforesaid tig. 1. Each ofthe tumblers'of each ofthe sets B C is connected with the opposite tumbler ofthe other set by means of a spiral spring, c, which draws the ends d of the tumblcrs together,

as hereinafter more fully explained. The pivotcd ond of each of the aforesaid tumblers is formed with an inwardly-extending arm, e, the extremities of the arms of the two series closely approaching each other in such manner as to be simultaneously acted upon by a cam, D, which is secured to the transverse shankfof the knob E. Formed upon one en d of this cani D are two teeth or cogs, g, which work or gear into a notch and tooth, a, formed in and uponl the sliding-frame F, as shown in dotted lines in iig. 1. This sliding-frame moves longitudinally within the case A, at oneV side thereof, and has formed upon its outer end two bolts, G, which work through suitable slots in the end of the -case A. Extending back from each of the said bolts is a rectangular spur, 7L, which, ,when the.sliding-f1ame F is drawn back in unlocking the door to which the lock is attached, tits into the rectangular recesses m of the tumblers of the adjacent series B or C, as the case may be, as hereinafter further set forth. The key-hole ,Yformed in the outer plate of the case A, is situated midway between the free ends of the two series of tnmblers, the shape and position of the same boing shown more clearly in dotted outline in iig. 1. The key I consists of an oblong metallic plate et' a width and thickness corresponding to the length and width of the key-hole, and notched or recessed at its opposite longitudinaledges,,as represented in ig. 2, in such manner that when inserted through the key-hole between the two sets B C of tumblers it will hold the tumblers of each set in such position that the rectangular slot or recess m thereof will be brought in lue with eachother, to permit the spurs z ofthe slidi'ng-frame F to pass into the same when such frame is moved hack in the operation of unlocking, as hcieinbefore set forth.

In the operation of unlocking, the knob E is rst turned in the direction indicated by the arrow in fig. 1, and causes the cam'D to act upon the arms e ofthe two sets of tumblers in such manner as to spread apart the free ends of the two series B C of the said. tumhlers, which, being-done, the key I is thrust through the key-hole into the space between the said series, und the knob E is turned in an opposite direction, whereupon the springs c force thc tumbler-s inward, so that each ofthe tumblers fits into one of the notches of the key I, and the said notches being of such depth and so arranged that when the tumblcrs rest in them, as just set forth, the slots or recesses m of each series will be in line with each other, and be situated immediately behind the spurs L ofthe sliding-frame F. The knob is then turned further in the same direction, which causes the teeth g to move the frame inward sufficiently to bring the bolts G inward beyond the end of the case A., and thus unlock the door to which the lock is attached. Inasmuch as when in this position the tumblers are fitted into the recesses or notches of the key'I, it follows that the said key cannot be withdrawn, so that when the key is in the lock it will a'ord a certain indication that the same is in an unlocked position. In the locking operation the knob is again turned in the direction of thevarrow, and moves the sliding-frame F outward, thus bringing the spurs !y out ofthe recesses m, and causing the bolts Gr to project out from the case A, after whichit operates the tuniblers to bring the same from the notches in the key I, which is then withdrawn, whereupon the reverse movement of the cam D allows tho springs c to bring the free ends of' the two series of tumblers together, as shown `in g. 1, thus eteetually closing the keyfhole, at the same time that any backward or unlocking movement of the frame F is prevented by the portions mi of the tumblers which are brought into position immediately behind the spurs h, as shown inthe aforesaid 1, the inward moi/ement of the tumblers being properly limited by a transverse stop, n, situated at a suitable point at the ends ot' the two series of the same.

What we claim as our invention and desire to secure by Letters Patent, is- 1. The combination of the twovopposite sets of tumblers, the key I, notched on both sides or edges, and the cam D, applied to operate vsimultaneously on both sets of tumblers, substantially as and for the purpose specified. 2. The cam D,eonst1'uctedlwith teeth g, the slidingfranie, furnished with bolts G and spurs 7L, and the two opposite sets of tumblers, arranged to operate in relation with each other'and with the key I, springs e, and stop n, substantially as and for the purpose specified.

EDWIN ALLEN, JAMES BRADY.

Witnesses:

W. H. PALMER, CHAs. N'. ALLEN. 

